Taxes may not be the most important consideration in portfolio planning, but prioritizing tax efficiency can mean a literal fortune for clients.Improving after-tax returns by 0.5% a year could result in a 50% difference in accumulated wealth after 30 years of retirement distributions, depending on certain factors, a Morgan Stanley report last year suggested.We recently asked advisors to tell us about their success in adjusting clients' portfolios to make them more tax-efficient in the long term.See the gallery for insights into the ways 12 financial advisors have helped their clients save money through more tax-efficient portfolios. Some responses have been lightly edited.(Image: Shutterstock)